Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2f7c87e80ae7915…

MALICIOUS

PDF

71.1 KB Created: 2021-09-28 03:41:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7d5451a5388e162f8c9bfdb904973cd0 SHA-1: 93f46110b8bfd46e71a07532161c06f0b3b5bbe0 SHA-256: d2f7c87e80ae79152ffb1861769b33eee95edd50911c2ff93ded5f1705931ab2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to link farms hosted on disposable domains, a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading a secondary payload. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://laborke.ru/uplcv?utm_term=download+free+fire+under+10mb PDF link annotation
    • http://terralis.eu/catalogue_dynamique/file/70512936184.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/53928624720.pdfIn PDF document text
    • http://votejoedestefano.com/editorData/file/33258368262.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/45097203273.pdfIn PDF document text
    • http://xinxinhouseware.com/uploadfile/files/90615466424.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/wubikimifarovizotedimilov.pdfIn PDF document text
    • http://irpuyesh.com/cache/fck_files/file/23710002031.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/fozulatasizawujifasusoju.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/lakogesimemamodor.pdfIn PDF document text
    • http://primeasset.hu/fileok/file/70743287692.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bce512d045---92211424087.pdfIn PDF document text
    • http://mariautonoleggiomarsala.it/userfiles/files/10564947285.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/30216693235.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/defudov.pdfIn PDF document text
    • https://thegioibaobicarton.com/Images_upload/files/vedazazavamerev.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/18391834538.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/47411838152.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/rofolemidewi.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/74695238543.pdfIn PDF document text
    • https://beauti-full.ru/uploads/files/likus.pdfIn PDF document text
    • http://swhos.com/upload/files/12053158414.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210924_0CB3BDFD89D27A76.pdfIn PDF document text
    • https://kudamatsu.org/userfiles/file/zurekibonuzo.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB165 16808 bytes
SHA-256: 949cf618a574e9ef72c04c794fa82c4a763fe813f2288bbbdc19123c1b89aa1d
font_01_sfnt_off0000dc8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8B 10752 bytes
SHA-256: a21820774d933fae92a68393e73e83a1d31c6938e4c93e468ad098a5af63154f
font_02_sfnt_off0000f540.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF540 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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